I felt it pretty much all along, but found that at the end, I was really worn out, and it hit me harder the longer I did it. I just tried to rest a lot and isolated myself a little when I felt really short with others.
I was susceptible to infection according to my doctors, but didn't seem to get sick. (as I mentioned.)
I did lose hair, which really sucked. But I didn't go bald, just lost a lot of volume. I never lost my apetite really - but that rarely happens to me. :-) I did have the unexpected nice result of dropping about 20 lbs (which I've gained back at this point and am trying to lose again - but slowly this time.)